The following kernel panic is repeatable on both 2.4.22 and 2.4.24. I'm
afraid I can't remember exactly which FTDI device it is but I can find out
if necessary - it's on a differnet machine.
It occurs when running a trivial "read from /dev/ttyUSB0, write to
/dev/null" program, at nice -5. I can provide the source to this program
if necessary.
I tried to start tracing it through, but I didn't follow the bit around
n_tty_receive_buf (it shouldn't be ae0 long), or which lock actually
corresponds to [usbserial].text.lock.usbserial+69
Vanilla 2.4.24 with ALSA 1.0.1 drivers loaded, but they do not seem to be
involved.
Scheduling in interrupt
ksymoops 2.4.4 on i686 2.4.24-custom. Options used
-V (specified)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.24-custom/ (default)
-m /boot/System.map-2.4.24-custom (specified)
kernel BUG at sched.c:564!
invalid operand: 0000
CPU: 0
EIP: 0010[<c0114f83>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010296
eax: 00000018 ebx: cfbb4474 ecx: 00000002 edx: 00000000
esi: ca382000 edi: ca382000 ebp: ca383c90 esp: ca383c6c
ds: 0018 es: 0018 ss: 0018
Process usb.agent (pid: 22347, stackpage=ca383000)
Stack: c023d9aa 00000000 ca382000 00000000 09691f73 00000000 cfbb4474 ca382000
ca05e4fc c6c58000 c0105b24 00000001 ca382000 cfbb447c cfbb447c cfbb441c
cfbb4400 c0105c70 cfbb4474 cfbb4400 00000000 d08c839b ca05e000 c6c58444
Call Trace: [<c0105b24>] [<c0105c70>] [<d08c839b>] [<c01977e9>] [<c01d9d1a>]
[<c0195f5e>] [<d08cd856>] [<d08afe1e>] [<d08b09ed>] [<d08afc59>] [<d08b0a9d>]
[<c01081ca>] [<c0108378>] [<c010a7a8>] [<c012fb3a>] [<c01248f8>] [<c01141fa>]
[<c0127018>] [<c01163fa>] [<c0118651>] [<c0106d93>]
Code: 0f 0b 34 02 a2 d9 23 c0 58 8b 45 e8 c1 e0 05 05 00 e5 2c c0
>>EIP; c0114f83 <schedule+53/310> <=====
Trace; c0105b24 <__down+54/a0>
Trace; c0105c70 <__down_failed+8/c>
Trace; d08c839b <[usbserial].text.lock.usbserial+69/dd>
Trace; c01977e9 <n_tty_receive_buf+ac9/ae0>
Trace; c01d9d1a <pci_pool_free+1a/e0>
Trace; c0195f5e <flush_to_ldisc+de/f0>
Trace; d08cd856 <[ftdi_sio]ftdi_read_bulk_callback+426/4b0>
Trace; d08afe1e <[uhci]uhci_unlink_generic+15e/180>
Trace; d08b09ed <[uhci]uhci_call_completion+12d/1b0>
Trace; d08afc59 <[uhci]uhci_transfer_result+d9/140>
Trace; d08b0a9d <[uhci]uhci_finish_completion+2d/50>
Trace; c01081ca <handle_IRQ_event+3a/70>
Trace; c0108378 <do_IRQ+68/b0>
Trace; c010a7a8 <call_do_IRQ+5/d>
Trace; c012fb3a <__free_pages+a/30>
Trace; c01248f8 <zap_page_range+188/250>
Trace; c01141fa <do_page_fault+17a/4ab>
Trace; c0127018 <exit_mmap+b8/120>
Trace; c01163fa <mmput+4a/70>
Trace; c0118651 <sys_init_module+61/670>
Trace; c0106d93 <system_call+33/38>
Code; c0114f83 <schedule+53/310>
00000000 <_EIP>:
Code; c0114f83 <schedule+53/310> <=====
0: 0f 0b ud2a <=====
Code; c0114f85 <schedule+55/310>
2: 34 02 xor $0x2,%al
Code; c0114f87 <schedule+57/310>
4: a2 d9 23 c0 58 mov %al,0x58c023d9
Code; c0114f8c <schedule+5c/310>
9: 8b 45 e8 mov 0xffffffe8(%ebp),%eax
Code; c0114f8f <schedule+5f/310>
c: c1 e0 05 shl $0x5,%eax
Code; c0114f92 <schedule+62/310>
f: 05 00 e5 2c c0 add $0xc02ce500,%eax
<0>Kernel panic: Aiee, killing interrupt handler!
--
Peter Denison <peterd at marshadder dot uklinux dot net>
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